Haber’s process of manufacture of ammonia uses Fe as a catalyst. When Nitrogen is adsorbed on the surface of iron, an electron transfer occurs from the metal surface to $N_{2}$ .
The CORRECT statement(s) among the following regarding this adsorption is/are

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Occupancy of $π_{2 p}^{*}$ increases

$N_{2}$ is chemisorbed

High heat is absorbed

bond length of $N_{2}$ is increased

answer is A, C, D.

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Detailed Solution

The electron from metal will be transferred to the LUMO, i.e., one of the $π_{2 p}^{*}$ MOs. This in turn results in lowering of bond order and hence lengthening of the bond.

As there is realignment of electrons during this process, it is chemisorption. Adsorption is always exothermic.

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